This is the official firmware for the Octasonic HC-SR04 Breakout that allows up to 8 HC-SR04 ultrasonic sensors to be monitored via SPI.

Make sure you have an appropriate AVR toolchain installed.

I originally used the following instructions from 2015:

https://web.archive.org/web/20150617015707/https://maxembedded.com/2015/06/setting-up-avr-gcc-toolchain-on-linux-and-mac-os-x/

Tested on Apple Silicon, Mac Ventura 13.5, October 2023

• Install Homebrew
• brew install avr-gcc
• brew install avrdude

You will also need an AVR programmer to connect to the Octasonic board. I use this one.

Connect the Octasonic board to the AVR Programmer and connect the AVR Programmer to a USB port on your computer and run the following commands.

cd firmware
make clean
make flash
make fuses